[gladys] weight as const reference in nav_graph
[weight_map] get reference to map (non const)
[weight_map] setup weight band
[python] update gladysplay w/weight_map
[weight_map] add cstr w/gdal weight-map
[python] clean gladysplay frontier scale
Fix idx method [scale]
[gdal] add custom origin
[test] add gdal scale test
[test] remove old python test
[test] add gdal custom origine io test